Hydraulic core extractor



March 3, 1931. R C.. BAKE HYDRAULIC CORE ExTRAc'ToR 2 Sheets-Sheet l Filed Jan.

mm /MN O. hm. mm wd INVENTOR.

MMU 6. @6b/29V. BY' L VMat ATTORNEYS.

March 3, 1931.- R. c. BAKER 1,794,356

4 HYDRAULIOCORE EXTRACTOR Filed Jan. 21, 1930 2 Sheets-Sheet 2 F- M F M.

. INVENTOR. Vww 6 mL/f A T ORNEYS.

Patented Mar. 3, 1931 REUBEN c. BAKER,

F COALINGA, CALIFORNIA, ASSIGNOB T0 BAKER 011| TOOLS, INC.,

OF HUNTINGTON PARK, ('JAIlZvIIFORXl'IA,r A .CORPORATION OF CALIFORNIA HYDRAULIC conn nx'rnacroa Application filed January 21, 1930. Serial No. 422,351.

This invention relates to auxiliary equipment employed during the. drilling of oil wells and more particularly pertains to improvements in the type of device described and claimed in my co-pending application entitled Device for removing cores from core tubes, Ser. No. 241,388, filed December 20, 1927.

In this prior application I have disclosed a manually operated hydraulic pumping device to which one end of a core tube is adapted to be connected so that the pump may be operated to apply hydraulic pressure to the core in the tube for forcibly ejecting the core from the tube. The pumping device includes a pump cylinder having two plungers concentrically disposed therein and capable of being operated in unison. One plunger, however, may be disconnected from the other and secured to the cylinder s'o that the other plunger may be operated independently. This enables the pump to be operated either under a low pressure or .under a high pressure.

It is the principal object o the present 1nvention to generally improve devices of the character referred to whereby to enable the change from low pressure operation to high pressure operation and vice versa to be easily and expeditiously effected. l

In carrying the invention into practice the pump cylinder is fitted with a pair of concentrically disposed telescopic plungers one of which is connected directly to an oscillatory handle so that it may be reciprocated. The

" other plunger is fitted with a connector device which is operative to connect the plunger either to the cylinder so that the high pressure plunger may operate independently or which may be connected to the high ressure plunger so that "the two'plungers wi 1 be reciprocated in unison. This connector device is so constructed and so associated with the other parts of the pump that in a single operation it may be disconnected from the high pressure plunger and connected tothe cylinder or vice versa. l

One form which the invention may assume is exemplified in the following description and illustrated by way of example in the ac- 50 companying drawings, in which Fig. 1 yis a central longitudinal section of a portion of a core tube showing a, preferred form of coupling for attachingva Vpressure unit thereto.

Fig. 2 is a side elevation of the type of pump to which this invention pertains with parts shown in section to expose the operation thereof.

Fig. 3 is a section taken on the line III--IIIy of Fig. 2.

Fig. 4 is similar to Fig. 2 having other parts shown in section.

Fig. 5 is a perspective view of the connector member. vReferring more particularly to the drawlngs and especially to Fig. 1, I show a core tube 10 containing a core indicated at 11. A pusher plunger 12 is disposed within the tube 10 against the core 1l. The plunger 12 is provided with cup leathers 111 adapted to expand against the sides of the tube to forni a seal therein when fluid pressure is exerted against the plunger 12. A sub 15 is screwed upon the end'of the tube 10 and has acentral .passage 16 existing therethrough forming communication beween the interior of the tube 10 and a fluid conducting pipe 17. It will be noticed that the sub 15 is provided with interior threads at one end and exterior threads at its other end so that it may be cornnected to either end of the tube 10 in order that the core 11 may be forced out of the tube in either direction.

In Figs. 2, 3 and 4 a base member 18 is shown supporting a cylinder 19 having a bore 20 therein. One end of the bore 20 is provided with an intake opening 21 in communication with a suitable source of fluid. supply, the inward flow of which is permitted and the outward iiow prevented y a check valve 22. The same end of the bore 20 communicates with a discharge port 23 communicating with the pipe 17, the opposite end of which appears in Fig. 1. A check valve 24 prevents the return of the fluid in the pipe 17 into the bore 20.

Reciprocably mounted within the cylinder V19 is a low pressure plunger 25 which is formed with a longitudinal bore 26 within which a high pressure plunger 27 is reciprocably mounted. A packing gland 28 is fitted to the end of the cylinder 19 around the low pressure plunger` to prevent leakage from the cylinder around the low pressure plunger 25. Similarly a packing gland structure 29 is arranged at the outer end of the low pressure plunger 25 to prevent leakage of fluid through the low pressure plunger around the high pressure plunger 27.

To reciprocate the plungers in the cylinder the outer end of the high pressure plunger 27 is fitted with a connecting element 30 which is pivotally connected to an operating lever 31. One end of this lever 31 is pivotally connected to a clip 32 secured to a bracket mounted upon the cylinder 19. The other end of the lever 31 which is not shown is suitably formed to be manually grasped for performing the pumping operation.

In order that the high and low pressure plungers may be operated either together or the high pressure plunger independently, a

f pair of lugs 34 extend outwardly from oppocylinder.

site sides of the connecting element 30.' Similar lugs 35 disposed at right angles to the lugs 34 protrude from the outer cylindrical surface of the cylinder 19. A connector or catch member generally indicated at 36 is secured to the outer end of the low pressure plunger 25 and surrounds the high pressure plunger 27. The body portion 37 of the connector is provided with a pair ot' semi-cylindrical downwardly extending tongues 38 adapted to partially surround the end of the cylinder 19 from which the lugs 35 protrude. A similar parof tongues 39 extend upwardly from the body portion 37 of the catch member so as to embrace the part of the connecting element 30 from which the'lugs 3l extend. The downwardly extending tongues 38 are formed with slots 40 in their edges and the upwardly extending tongues are formed with similar slots 4l. I It will be noticed in referring to Fig. 5 that the slots 40 and the slots 41 are so disposed that their open ends face in opposite directions in relation to the periph-1 eral surface of the catch member.

To operate the low pressure plunger the catch member 36 is turned until `the slots 41 in the upwardly extending-tongues engage the lugs 34. When the catch member is in this position the lugs 35 on the cylinder 19 extend into the open portions between the downwardly extending tongues and the catch is free to reciprocate relative to the As the catch is secured to the low pressure plunger and engaged by the lugs on the connecting element 30, it is obvious that operation of the lever 31 will cause the low pressure plunger tg reciprocate within the bore 20 of the cylinder 19 in unison with the high pressure plunger.

When it is desired to operate the high -tube l0 is removed pressure plunger independently, the level' 3l is moved until both ot' the plungers occupy their innermost positions. The catch member is then' turned in the opposite direction whereby engagement is formed between the lugs on the cylinder 19 and the slots 40 in the downwardly extending tongues of the catch. The lugs 34 are simultaneously disengaged so that the high pressure plunger is free to be reci' the lever 3,1. Reciprocatiou of the low pressure plunger is prevented because it is held securely in relation to the cylinder 19 by means of the catch member and the lugs 35.

In operation of the device, after the core has been taken by the core barrel, the core and its trimmer shoe is removed. 'lhe pusher plunger 12 is then inserted in the end of the core tube and the sub 15 is screwed onto the tube and the necessary connections are made between the sub and the pumping'unit.

The catch 36 is then turned so that the low pressure plunger may be reciprocated in unison with the high pressure plunger by the lever 31 as has been described. 0n its outward stroke the plunger will create a suction with the bore 20 opening the check valve 22 and causing fluid to enter the cylinder 19 through the opening 21. On the return stroke the valve 22 will close and the valve 24 will open permitting the fluid to discharge outwardly through the opening 23.

It will be seen that on each outward stroke of the plunger, fluid will be drawn into the cylinder through the opening 2l and with each inward stroke the Huid will be ejected from the cylinder through the discharge opening 23 and by Way of the pipel7 through the sub and into the end In this manner pressure will be exerted against the pusher plunger mounted within the core tube and will force the same outwardly causing the core to move through the core tube.

In the event that the. use of low pressure is insutlieient, the catch 36 is turned whereby the low pressure plunger will be secured to the cylinder 19 and the high pressure plunger will be free to reciprocate through the low pressure one. A higher stage of pressure transmission is attained in this manner. The pumping operation is continued until the pusher plunger has passed through the entire length of the core tube and the core has been ejected therefrom.

From the foregoing it is obvious that I have provided a two stage force removing cores from core tubes, the same being simple in design and construction and having novel means for quickly altering its phase of pressure transmission during its operation.

While I have shown the preferred form of my invention, it is to be understood that rocated independently by pump for l necte with the lugs on the various changes may be made in its construction by-those skilled in the art without departing from the spirit of the invention as defined in the appended claim.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

A deviceof the character described includ-` ing a cylinder, a pair of reciprocable pluli ers concentrically mounted therein, a pair of ugs projectin from the outer surface of the cylinder at diametrically opposed points thereon, a

with the innermost plun' er and arranged at right angles to the ugs on the cylinder, a catch member rotatably mounted on the outermost plunger, said catch member having depending portions, said depending portions having slots formed therein for engagement with the lugs on the cylinder to connect the outermost plunger to the cylinder, upwardly projecting portions on said catchmember, said upwardly projecting portions having slots therein for engagement slots in the upwardly projecting portions and downwardly projecting portions being so formed that rotation in one direction of the catch member will simultaneously release the catch member from one pair of lugs and engage the catch member with the other pairand an operating lever connected of lugs,

plunger for operating the with theinnermost device. A

- REUBEN C. BAKER.

air of diametrically opposed lugs coninnermost plunger, said 

